Cupboard latch



April 1, 1930. B. HURD 1,752,559

CUPBOARD LATCH Filed April 2l 1927 lgal . i Mmm-ww Invear 3 Charles Bosa'c/' fur'c www Patented Apr. 1, 1930 UNITED STATES CHARLES BOSTICK HURD, 0F SANTA ANA, CALIFORNIA CUIPBOARD LATCH Application filed April 21,

This invention is of general application to door catches of the mortise type, but, is more particularly applicable to mortised catches having spring actuated bolts and knobs, or

5 handles, and shanks for moving the bolts to unlatched positions.

An object of the invention is to provide an improvement in shank operated latches of the mortise type which involves few parts and is inexpensive and the installation of which involves only such adaptation of the door and j amb as may be accomplished solely by augers, or similar boring tools. One of the advantages aimed at is easy longitudinal operation of the bolt by the turning of a knob.

Another object is to provide in a latch of this type a simple means for connecting the latch bolt with the knob-shank which means coacting with the latch casing serves as a lock against door opening except by a rotation of the knob shank and which means also acts to hold the knob shank to the latch bolt during installation.

A feature of the invention is in the particular shaping of the several parts of the latch whereby their installation involves the making of receiving mortises, cavities and holes solely by boring tools.

Among the advantages is simplicity and cheapness of construction and a minimum of time and effort in installation.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detaileddescription and the appended claims.

The accompanying drawing illustrates the invention.

Figure 1 is a longitudinal sectional elevation of a latch embodying my invention, as installed in a door having its hinges at the right hand side, fragments only of the door and door jamb being shown.

Fig. 2 is a view similar to Fig. 1, showing the latch as installed in a door having its hinges at the left hand side.

Fig. 3 is a vertical sectional elevation taken on the line m3, Fig. 1.

Fig. l is a plan view taken on the line Fig. 1.

Fig. 5 is a perspective view of the latchV 1927. Serial N0. 185,500.

barrel showing the bayonet slot for holding the knob-shank.

Fig. 6 is a view similar to Fig. 5 showing a bearing for theknob-shank.

Fig. 7 is a perspective view of the latchbolt showing the cam faced recess for bolt movement by a knob.

' Fig. 8 is a view similar to Fig. 7 showing a cut away for accommodating the knobshank.

Fig. 9 is a perspective view of the keeper and striking plate.

A and B designate generally the door and door j amb, respectively, which are shown only fragmentarily in Figs. 1 and 3, and may be of any conventional construction.

The catch proper comprises a casing 1, the body 2 of which is tubular, and constructed preferably from a length of cylindrical metal tubing, having its inner end closed, as by an end 3, drawn or constructed as a metallic disc and brazed, or otherwise secured and extending nearly half way round the casing, at the end of the body. The casing has in the front side, at approximately its longitudinal center, a tappet way 4; and in the top side, a slot 5, open intermediate its ends to the tappet way l and terminating a short disstance beyond eachside of the tappetway, forming therewith a bayonet slot, and said casing has a hole, or perforation 6, in the rear side, open to the tappet-way 4.

The latch bolt 7 is of substantially cylindrical shape, and has in its front side next its outer end a flat face 8 terminating at an outwardly extending shoulder 9 and the outer end of the bolt is bevelled to form the striking face 1 0. The bolt is provided at approximately its longitudinal center with a cam notch 11, the rear wall of which forms a cam 12 for bolt movement, and, in the bottom side of the bolt there is a cut-away 13 providing clearance for the bolt moving means.

Into the casing, there is first placed a compression spring 14:, and the bolt is fitted in the casing with its notch 11 registering with the tappet-way 4 of the casing.

A flush-plate 15, of disc-shape and of greater diameter than the casing, is secured, as by brazing, to the casing end. As best shown in Fig. 5, the flush plate has an opening 16 conformed to the liat faced portion of the bolt which is thereby held again rotation in the casing, with its notch 11 properly related to the tappet-way il, and its shoulder S) held by the fiush pla-te to limited movement outwardly, beyond the casino:

The. latch operating means comprises a. shank 17 and a bolt 'throwing element or tap pet 18, which is shown as a pin extended through and secured to the' shank, to which a pull as the knob 19 is secured.

A keeper 20, constructed as a substantially circular open metal ring having an extension 21 is provided to serve as a striking plate for the bevel face 10 of the projecting end of the bolt.

The knob is secured to the shank as by a Afitting into which the base of the knob is seated, and from which fitting extends a sleeve 23 which is slipped over the shank. An escntcheon is placed over the sleeve, nei; the fitting and the knob, shank and escutcheen held assenibled by a pin 25 extended through the sleeve and shank, as best shown in Fig. 3.

To install the latch a shallow hole 26, to seat the flush plate 15, is bored in the edge of the door A, and central to such shallow hole, a relatively deep hole 27, to seat the casing, bored` and a hole Q8 bored into the face of the door to intersect the hole 27 and to receive and accommodate the shank 17 and its element 18.

To install the keeper, a shallow hole 29, to seat the keeper, is bored in the face of the door j amb B and central to the shallow hole, a relatively deep hole 30, to receive the bolt end, is bored.

An advantage incident to the shaping of the several parts of my latch is that the latch may. by simple inversion of parts, be used either in a right or left hand swung, or hinged, door.`

In Fig. 1, the latch is installed as in a right hand swung door, in which the bolt throwing element 18 is pointed upwardly, and the shank disposedbeneath the bolt. By a sim ple end for end bodily inversion of the latch and bolt, and a placing of the shank above the bolt with its element pointed downwardly as shown in Fig. 2, the latch, without alteration may be installed in a left hand swung door.

By preference, and as shown, the bolt throwing element, namely the pin 18, is of such lengthto extend beyond the periphery of the bolt 7 and the casing 1 isprovided with a longitudinally disposed slot 5 to accommodate` the projected end of the pin, in any of its positions.-

By reason of ithe slot 5 being open to the tappet-way 4, the pin ina-,v be readily introduced alongwith the shank 17, to its operating position through the tappetway 4 and into the slot 5. Upon manual release of the shank, after the pin has been introduced into the slot 5, the spring serves to advance the bolt and carry the pin forwardly in the slot 5, beyond the tappetay Ll and thus the pin and slot 5 act as a means for releasably securing the bolt throwing means against displacement during the final installing steps, which includes the securing of the escutcheon 24.

I claim 1. A latch comprising a cylindrical tubular casing having a bayonet slot, a substantially cylindrical bolt slidably mounted in the casing, and, having a notch in its side and a cutaway intersecting the notch, a shank for extension into said cut-away, a pin carried by the shank for engagement in said notch; and a spring for normally holding the bolt to a position seating said pin in the bayonet slot.

2. A latch comprising a cylindrical tubular casing, having a bayonet slot, a substantially cylindrical bolt having a transverse cut-away and a cam faced notch, a spring acting on the bolt to normally hold it in latched position` means 4for holding the bolt against rotation in the casing, a shank, and a pin carried by the shank for the throwing of the holt and for engagement in the bayonet slot to form with the bolt and spring releasable means for securing the shank to the casing.

3. A latch comprising a cylindrical casing` having a tappet way extending around one side and a slot extending along the casing and open to one end of the tappet way and extending on opposite sides thereof; a bolt in the casing and extending therealong and provided with a notch in one side and a cam way open to the notch and to said slot; a shank journalled in the casing and provided with a pin to operate as a tappet in the cam way and extending into the slot; said shank being adapted and arranged to be turned for the purpose of moving the bolt longitudinally.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 16th day of April, 1927.

CHARLES BOSTICK IIURI).

IHN 

